Coal is extraordinarily abundant - we'll never run out - and pound-for-pound contains twice as much energy as wood.

地球上的煤炭异常丰富——我们用都用不完——同样体积的煤炭所含的能量是木头的两倍。

youdao

Chemical energy, which is everything from wood to crude oil to gasoline to coal, consists of playing with the electrons, changing their energy state.

从木头、原油、汽油到煤炭，它们中释放出来的化学能量是通过改变其中电子的能量状态实现的。

youdao

Since the state has the highest percentage of timberland in the country, it is not surprising that a large portion of its energy comes from wood and wood waste.

鉴于该州有美国最大的林地，它大部分的能源来自于木材一点也不新奇。

youdao

Due to the economic downturn, there has been what Paul McConnell, senior analyst at energy research group Wood Mackenzie, calls a "collapse in industrial demand for energy".

BBC: Coal resurgence calls undermine clean energy commitments

Historically man has continuously reduced the cost of energy moving from wood, to coal, to oil, but now progressed has stalled.

FORBES: My Top 10 Economic Worries

Energy services provider Wood Group PSN (WGPSN) has won a contract to support the expansion of an oil field in Iraq.

BBC: Aberdeen's Wood Group wins Iraq contract